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Energy Stored in a Capacitor A charged capacitor stores electric potential energy in the electric field between the plates The potential energy stored in the plates is equivalent to the work done to charge the plates. This work is usually done by a battery As charge is added to the plates, it takes increasingly more work to add additional charge because of electron repulsion

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Energy Stored in a Capacitor We can then say that the energy “stored” in the capacitor is: W (J) Q (C)